1. Java中泛型Class<T>、T与Class<?>、 Object类和Class类、 object.getClass()和Object.class

2. [利用泛型和反射,让public static <T> T print(Class<T> clazz, int id)方法,更具一般性]

(https://blog.csdn.net/zbw18297786698/article/details/50895552)
3.几个泛型方法

//1.有返回类型
    public static <T> T print(Class<T> clazz) {
        T t=null;
        try {
            t=clazz.newInstance();
            //return clazz.newInstance();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        }
        return t;
    }
    //2.有返回类型，参数不带泛型时需要强转
    public static <T> T print2(Class clazz) {
        T t=null;
        try {
            t= (T) clazz.newInstance();
            //return clazz.newInstance();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        }
        return t;
    }
    //3.有返回类型
    public static <T> T print2(T t){
        return t;
    }
    //4.无返回类型
    public static <T> void print(){

    }
    //5.无返回类型
    public static <T> void print(T t){

    }

4.泛型类的用法

//泛型类
 public class Test<T>{
        private T name;
        public void setName(T name) {
            this.name = name;
        }
    }